Stand Alone XBlS machines at airports commonly work on the principle of
ion mobility spectrometry
gas chromatography
backscatter technology
electromagnetic radiation
Answer is Wrong!
Answer is Right!
This question was previously asked in
UPSC CISF-AC-EXE – 2019
– Transmission X-ray imaging passes X-rays through the object and detects those that penetrate.
– Backscatter X-ray imaging detects the X-rays that are scattered back towards the source, providing information about the surface and composition of the object.
– Many modern security X-ray scanners use both transmission and backscatter techniques for enhanced detection.